A line has slope $0.75$ and passes through the point $(-2, -3)$. What is the equation of the line in slope-intercept form?
A$y = 0.75x - 1.5$
B$y = 0.75x + 1.5$
C$y = 0.75x - 3$
D$y = 0.75x - 4.5$
Answer & Solution
Correct answer: A. $y = 0.75x - 1.5$
Slope-intercept form: $y = mx + b$. Here $m = 0.75$, so the line is $y = 0.75x + b$ for some $b$.
Substitute the known point $(-2, -3)$:
$-3 = 0.75 \cdot (-2) + b$
$-3 = -1.5 + b$
$b = -3 + 1.5 = -1.5$.
So the line is $y = 0.75x - 1.5$.
- Trap B flips the sign of $b$.
- Trap C uses the point's $y$-coordinate ($-3$) directly as the intercept — but $(-2, -3)$ is **not** on the $y$-axis, so $-3$ is *not* the intercept.
- Trap D applies $0.75 \cdot (-2) = -1.5$ but adds it to $-3$ instead of subtracting from $-3$.
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